unit LookupU;
   (* 
   WorldVistA Configuration Utility
   (c) 8/2008 Kevin Toppenberg
   Programmed by Kevin Toppenberg, Eddie Hagood  
   
   Family Physicians of Greeneville, PC
   1410 Tusculum Blvd, Suite 2600
   Greeneville, TN 37745
   kdtop@yahoo.com
                                                 
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  *)

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ORCtrls, Buttons;

type
  TFieldLookupForm = class(TForm)
    ORComboBox: TORComboBox;
    OKBtn: TBitBtn;
    CancelBtn: TBitBtn;
    procedure ORComboBoxNeedData(Sender: TObject; const StartFrom: String;
      Direction, InsertAt: Integer);
    procedure FormShow(Sender: TObject);
    procedure ORComboBoxDblClick(Sender: TObject);
  private
    { Private declarations }
    FFileNum : String;

  public
    { Public declarations }
    procedure InitORComboBox(ORComboBox: TORComboBox; initValue : string);
    procedure PrepForm(FileNum,InitValue : string);
    function SubSetOfFile(FileNum: string; const StartFrom: string;
                          Direction: Integer): TStrings;
  end;

var
  FieldLookupForm: TFieldLookupForm;

implementation

uses
ORNet, ORFn,
Trpcb,   //needed for .ptype types
QControls, fPtDemoEdit;
{$R *.dfm}

  procedure TFieldLookupForm.ORComboBoxNeedData(Sender: TObject;
                                                const StartFrom: String;
                                                Direction, InsertAt: Integer);
  var
    Result : TStrings;
  begin
    Result := SubSetOfFile(FFileNum, StartFrom, Direction);
    TORComboBox(Sender).ForDataUse(Result);
  end;

  procedure TFieldLookupForm.InitORComboBox(ORComboBox: TORComboBox; initValue : string);
  begin
    ORComboBox.Text := initValue;
    ORComboBox.InitLongList(initValue);
    if ORComboBox.Items.Count > 0 then begin
      ORComboBox.Text := Piece(ORComboBox.Items[0],'^',2);
    end else begin
      ORComboBox.Text := '<Start Typing to Search>';
    end;
  end;

  procedure TFieldLookupForm.PrepForm(FileNum,InitValue : string);
  begin
    FFileNum := FileNum;
    Self.Caption := 'Pick Entry from File # ' + FileNum;
    //if (FileNum='200') and (InitValue='') then begin
    //  InitValue := fPtDemoEdit.CurrentUserName;
    //end;
    InitORComboBox(ORComboBox,InitValue);
  end;

  
  function TFieldLookupForm.SubSetOfFile(FileNum: string; 
                                         const StartFrom: string;
                                         Direction: Integer       ): TStrings;
                                         
  { returns a pointer to a list of file entries (for use in a long list box) -  
    The return value is a pointer to RPCBrokerV.Results, so the data must 
    be used BEFORE the next broker call! }
  var 
    cmd,RPCResult : string;  
  begin
    RPCBrokerV.remoteprocedure := 'TMG CHANNEL';
    RPCBrokerV.Param[0].Value := '.X';  // not used
    RPCBrokerV.param[0].ptype := list;
    cmd := 'FILE ENTRY SUBSET';
    cmd := cmd + '^' + FileNum + '^' + StartFrom + '^' + IntToStr(Direction);
    RPCBrokerV.Param[0].Mult['"REQUEST"'] := cmd;
    //RPCBrokerV.Call;
    CallBroker;
    RPCResult := RPCBrokerV.Results[0];    //returns:  error: -1;  success=1
    if piece(RPCResult,'^',1)='-1' then begin
     // handle error...
    end else begin
      RPCBrokerV.Results.Delete(0);
      if RPCBrokerV.Results.Count=0 then begin
        //RPCBrokerV.Results.Add('0^<NO DATA>');
      end;
    end;
    Result := RPCBrokerV.Results;
  end;
  
  procedure TFieldLookupForm.FormShow(Sender: TObject);
    var mousePos : TPoint;
  begin
    GetCursorPos(mousePos);
    with FieldLookupForm do begin
      Top := mousePos.Y - 39;
      Left := mousePos.X - 15;
      if Left + Width > Screen.DesktopWidth then begin
        Left := Screen.DesktopWidth - Width;
      end;
    end;
//    ORComboBox.DroppedDown := true;
  end;


procedure TFieldLookupForm.ORComboBoxDblClick(Sender: TObject);
begin
  Modalresult := mrOK;  //Close form, item should be selected (?)
end;

end.